Efibula yaoshanensis Y. L. Deng & C. L. Zhao, 2025

Deng, Yinglian, Chen, Meng, Wang, Kaisheng, Liu, Wanting, Chen, Daxiang, Yang, Shunqiang, Li, Wenli, Zhou, Hongmin & Zhao, Changlin, 2025, Morphological and phylogenetic analyses reveal one new genus and six new species in Irpicaceae and Steccherinaceae (Polyporales, Basidiomycota) from the Yunnan – Guizhou Plateau, Asia, IMA Fungus 16, pp. e 172367-e 172367 : e172367-

Efibula yaoshanensis Y. L. Deng & C. L. Zhao sp. nov.

Figs 11 , 12

Diagnosis.

Efibula yaoshanensis differs from other species in the genus by cream, brownish-orange to cinnamon-buff hymenial surface, thin-walled generative hyphae bearing simple septa, and ellipsoid basidiospores (5–6.5 × 3–4 µm).

Etymology.

Yaoshanensis (Lat.): referring to the locality (Yaoshan) of the type specimen.

Type.

CHINA • Yunnan Province, Zhaotong, Qiaojia County, Yaoshan Town, Yaoshan National Nature Reserve , GPS coordinates: 27°08'N, 103°09'E, altitude 2220 m asl., on fallen angiosperm branch, leg. C. L. Zhao, 22 August 2020, CLZhao 20575 ( SWFC) .

Description.

Basidiomata annual, resupinate, closely adnate, membranous to subceraceous, up to 7 cm long, 1.8 cm wide, and 200 µm thick. Hymenial surface smooth, cream when fresh, brownish-orange to cinnamon-buff upon drying; margin thinning out, white to cream, up to 1 mm. Hyphal system monomitic; generative hyphae bearing simple septa, colorless, thin-walled, slightly encrusted with crystals on some hyphae, 1.8–3.2 µm in diameter; IKI –, CB –; tissues unchanged in KOH. Cystidia and cystidioles absent. Basidia long clavate, four sterigmate, with a simple septum at the base, 20–27 × 4–6 µm, smooth, thin-walled, basidioles dominant, in shape similar to basidia, but slightly smaller. Basidiospores ellipsoid, colorless, thin-walled, smooth, IKI –, CB –, 5–6.5 × 3–4 µm, L = 5.56 µm, W = 3.21 µm, Q = 1.74 (n = 30 / 1).

Notes.

The phylogenetic analyses (Figs 4 , 5 ) showed that the new species Efibula yaoshanensis was sister to E. yunnanensis C. L. Zhao. However , morphologically, E. yunnanensis differs from E. yaoshanensis by having a smooth, cream to pale brown hymenial surface ( Ma et al. 2020).

Figures

Figure 4. Divergence time estimation of families within Polyporales based on Bayesian evolutionary analysis sampling trees using the combined ITS, nLSU, mtSSU, rpb 2, and tef 1 - α sequence dataset. Posterior probabilities are not less than 0.80, and the mean ages of each node are annotated. The 90 % highest posterior density intervals of divergence time estimates are indicated by horizontal bars.

Figure 5. Odentinium aurantium (holotype, CLZhao 20737). a basidiomata. b macroscopic characteristics of hymenophore. Scale bars: 1 cm (a); 1 mm (b).

Figure 11. Efibula yaoshanensis (holotype, CLZhao 20575). a basidiomata. b macroscopic characteristics of hymenophore. Scale bars: 1 cm (a); 1 mm (b).

Figure 12. Microscopic structures of Efibula yaoshanensis (holotype, CLZhao 20575). a basidiospores. b basidia and basidioles. c a section of the hymenium. Scale bars: 5 µm (a); 10 µm (b, c).